Put a magnet on the inside of the hull over a reed switch on the outside wired to an air bag behind the drop weigh. Wahalla - Rocket assisted drop weights. --Doug J
In a message dated 2/18/2004 3:27:31 PM Central Standard Time, pipo305@hotmail.com writes:
I saw a sub that use a hydraulic jack for drop weight. the pump is inside
the sub and the "jack" is a hydraulic cylinder that release the weight. This
way, there is no leakage possible because the thruht hull is not with mobile
parts.
Sorry for my english, I'm just very tired...
Pierre poulin
>From: "Alec Smyth" <Asmyth@changepoint.com>
>Reply-To: personal_submersibles@psubs.org
>To: <personal_submersibles@psubs.org>
>Subject: RE: [PSUBS-MAILIST] Flying Sub "SOLO" Stability
>Date: Wed, 18 Feb 2004 13:10:17 -0500
>
>Shaughn, do you have any more info on how you are dropping those 4
>weights? I think I'm past making holes in the pressure hull at this
>point, but just curious whether you have a dropping mechanism in mind
>that does not imply through-hulls. I'm using a 1.5" shaft through the
>hull, with a cam shaped channel machined into it. But as someone pointed
>out, it'll only drop the weight if the sub is upright.
>
>Thanks,
>
>Alec
>
>-----Original Message-----
>From: NeophyteSG@aol.com [mailto:NeophyteSG@aol.com]
>Sent: Wednesday, February 18, 2004 11:17 AM
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] Flying Sub "SOLO" Stability
>
>In a message dated 2/17/04 7:43:20 PM Pacific Standard Time,
>SFreihof@aol.com writes:
> Interesting design, so I have a question. If you were to drop
>the emergency weight (like in an emergency), wouldn't the sub become
>unbalanced (top heavy) and roll over?
>
> Stan
>I can't answer for Alec, but in my case, I chose not to use the
>traditional single keel-ish drop weight for just that reason. It became
>apparent early on that that it also dramatically limited where I could
>place other hardware and still maintain relatively neutral centers of
>mass and buoyancy that are ideal for hydrobatics. Because my drop
>weights (4) are symmetrically located more or less in the horizontal
>plane passing through the longitudinal axis of the hull (2 front; 2
>back), dropping them doesn't produce a righting moment around that axis.
>
>
>However, they *are* placed to cause a righting moment between bow and
>stern. In the event that I still have my relatively large control
>surfaces, that righting moment should help facilitate rising glide. In
>the event I've also jettisoned the entire exostructure, being conical,
>my pressure hull will automatically float "head up" ... a good thing
>considering that's where the hatch is.
>
>Warm Regards
>Shawn
>
>*****
>
>"Call nothing thy own except thy soul.
>Love not what thou art, but only what thou may become.
>Do not pursue pleasure, for thou may have the misfortune to overtake
>it...
>Live in the vision of that one for whom great deeds are done ..."
>
>Man of LaMancha, D. Wasserman
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